Răspunsuri

2014-05-22T11:15:14+03:00
T=2x   x-primul baiat   y-al 2lea 
t=3y
x-y=15
x=15+y

t=2(15+y)=30+2y

t=3y

30+2y=3y
3y-2y=30
y=30
t=3*30=90
x=30+15=45
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